Abbasi Ambreen, Hanif Summaiya, Shakir Mohammad
Division of Inorganic Chemistry, Department of Chemistry, Aligarh Muslim University Aligarh 202002 India
RSC Adv. 2020 Jan 17;10(6):3137-3144. doi: 10.1039/c9ra10372d. eCollection 2020 Jan 16.
A facile and green method was adopted to synthesize highly selective gum acacia-mediated silver nanoparticles as dual sensor (fluorescence turn-on and colorimetric) for Hg(ii) and fluorescence turn-off sensor for S and malachite green. The mechanism proposed for a dual response towards Hg(ii) is the redox reaction between Ag(0) and Hg(ii), resulting in the formation of Ag(i) and Hg(0) and electron transfer from gum acacia to Ag(i), which further leads to the formation of an Ag@Hg nanoalloy. The enhanced fluorescence signal was quenched selectively by S owing to the formation of AgS and HgS. The reported nanosensor was found to be useful for sensing malachite green the inner filter effect. The linear ranges were 3 nmol L to 13 μmol L for Hg(ii), 3-170 μmol L for S and 7-80 μmol L for malachite green, and the corresponding detection limits were 2.1 nmol L for Hg(ii), 1.3 μmol L for S and 1.6 μmol L for malachite green.
采用一种简便且绿色的方法合成了高选择性阿拉伯胶介导的银纳米颗粒，作为用于检测汞（II）的双传感器（荧光开启和比色）以及用于检测硫和孔雀石绿的荧光关闭传感器。针对汞（II）的双响应提出的机制是银（0）与汞（II）之间的氧化还原反应，导致形成银（I）和汞（0），以及电子从阿拉伯胶转移到银（I），这进一步导致形成银@汞纳米合金。由于形成了硫化银和硫化汞，硫选择性地淬灭了增强的荧光信号。发现所报道的纳米传感器可用于通过内滤效应检测孔雀石绿。汞（II）的线性范围为3 nmol/L至13 μmol/L，硫为3 - 170 μmol/L，孔雀石绿为7 - 80 μmol/L，相应的检测限分别为汞（II）2.1 nmol/L、硫1.3 μmol/L和孔雀石绿1.6 μmol/L。
